174 LEAFLETS. 



notably glaucous ; cyme apparently terminal only, but long- 

 stalked and rather loose ; sepals triangular-lanceolate, not very 

 acute; corolla white, the tube slightly campanulate, the lobes 

 erect, but broad, short and obtuse. 



From a sand bar at Plum Point, on the shore of Chesapeake 

 Bay, southern Maryland, collected 5 Aug., 1902, by Geo. H. 

 Shull, and deposited in U. S. Herb., under the collector's 

 determination as ''A. album, Greene"; but the plant, while 

 clearly white-flowered, has corollas of a peculiar pattern for 

 those of any eastern ally of A . cannabhtunt in that they are not 

 cylindric, but distinctly campanulate. They have also more 

 obtuse lobes than are to be found in any other known member 

 of either group. The habitat of A, arenarium is maritime. 



Apocynum cervinum. Plant 3 or 4 feet high, simple to 

 above the middle, there only twice or thrice dichotomous, of 

 a very pale glaucous hue throughout, the lower face of foliage 

 hardly more so than the upper, the venation not particularly 

 conspicuous though almost white ; leaves of main stem 4 inches 

 long, \yi in width, oblong-oval, rounded and subcordate at 

 base, at apex abruptly acute as well as mucronate ; cymes of 

 thrice the size of those of A. cannabinum, long-peduncled, 

 many-flowered, the flowers large for the group, also whitish ; 

 sepals lanceolate, mostly not acute, not equalling the corolla- 

 tube ; corolla whitish but with a lurid tinge of something 

 between green and purple, the tube short-cylindric, the lobes 

 broad, ovate, obtuse, somewhat spreading. 



This is C. F. Baker's n. 80 from the Gunnison River region 

 in southern Colorado, collected at Deer Run, where said to 

 be common in moist ground. It was a hasty judgment that 

 allowed this to pass for A, carmabinum. 



Apocynum convallarium. Herbage glabrous, and of the 

 brighter and more vivid green of A. cannabinum ; but here 

 more than ordinarily bright, all the foliage marked very con- 

 spicuously with whitish mid vein and feather veins, and this 

 even to the pale glaucescent lower face ; proper cauline leaves 



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